I used to have an okay car stereo (Pioneer 6600DAB) until I cleaned my HVAC system with professional cleaning fluid - that somehow dripped from the vent channels into the radio. Containing chlorine, the fluid is highly conductive, and even though the display and everything else seems to work, there's no sound.
So I wonder: Can I somehow connect an USB-port, an old MP3-player, and the car's audio cables? I don't listen to radio and I don't need any of the other functions. Only occasionally I need to press play on the thing and listen to what's on a 64GB USB disk.